20512451144 has 16 divisors (see below), whose sum is σ = 38462478720. Its totient is φ = 10255790160.

The previous prime is 20512451111. The next prime is 20512451153. The reversal of 20512451144 is 44115421502.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238577 + ... + 312959.

It is an arithmetic number, because the mean of its divisors is an integer number (2403904920).

Almost surely, 2^20512451144 is an apocalyptic number.

It is an amenable number.

20512451144 is a deficient number, since it is larger than the sum of its proper divisors (17950027576).

20512451144 is a wasteful number, since it uses less digits than its factorization.

20512451144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108860 (or 108856 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 20512451144 its reverse (44115421502), we get a palindrome (64627872646).

The spelling of 20512451144 in words is "twenty billion, five hundred twelve million, four hundred fifty-one thousand, one hundred forty-four".